Hi,
Sorry for the issues you are having. I can help troubleshoot this with you.
We were having issues with some customers not being able to Download Pro 3.12.2 (latest version), but we believe those are fixed.
As for the license not saving.
Can you please confirm you are following all these steps:
Visit License Tab
Enter License Key
You get a Green License Valid Message
You are then clicking “Save Changes”
Then you get a “License key(s) updated.” near the top of the page.
Let me know if it is not working after following those steps and we can do some troubleshooting steps next.
Thanks